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The central pollen donor source consisted of 3 x 3 m square of L. rigidum biotype resistant (R) to diclofop-methyl (36 containers with 25 resistant ryegrass seedlings each, A), surrounded by pots placed in eight directions and at five distances (0, 1, 5, 10 and 15 m) containing plants of a susceptible (S) L. rigidum biotype (3 containers per sampling point, 12 susceptible seedlings each, B).
